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y in (-oo:+oo)
(1/3)*(7*y-2)+(1/6)*(4*y+7) = 0
1/3*(7*y-2)+1/6*(4*y+7) = 0
1/3*(7*y-2)+1/6*(4*y+7) = 0
3*y+1/2 = 0
3*y+1/2 = 0
3*y+1/2 = 0 // - 1/2
3*y = -1/2 // : 3
y = -1/2/3
y = -1/6
y = -1/6
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